condition mean min max ZT0-3 16.35 16.35 16.35 ZT4-7 13.1 13.1 13.1 ZT8-11 30.1 30.1 30.1 ZT12-15 19.65 19.65 19.65 ZT16-19 14.25 14.25 14.25 ZT20-23 15.0 15.0 15.0